Notre Dame on fire

After the Notre Dame fire, scientists get a glimpse of the cathedral’s origins



He notes that builders lifted 100-kilogram stones more than 60 meters off the ground without the benefits of modern technology. Exactly how this was accomplished has been lost to time, he says.

Erm :unsure: , rope and pulley
 
Slavery got stuff done back in the day
drop-the-mic-obama-mic-drop.gif
 
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